path: root/cmd/ethkey/inspect.go

// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "encoding/hex"
    "fmt"
    "io/ioutil"

    "github.com/ethereum/go-ethereum/accounts/keystore"
    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/crypto"
    "gopkg.in/urfave/cli.v1"
)

type outputInspect struct {
    Address    string
    PublicKey  string
    PrivateKey string
}

var commandInspect = cli.Command{
    Name:      "inspect",
    Usage:     "inspect a keyfile",
    ArgsUsage: "<keyfile>",
    Description: `
Print various information about the keyfile.

Private key information can be printed by using the --private flag;
make sure to use this feature with great caution!`,
    Flags: []cli.Flag{
        passphraseFlag,
        jsonFlag,
        cli.BoolFlag{
            Name:  "private",
            Usage: "include the private key in the output",
        },
    },
    Action: func(ctx *cli.Context) error {
        keyfilepath := ctx.Args().First()

        // Read key from file.
        keyjson, err := ioutil.ReadFile(keyfilepath)
        if err != nil {
            utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
        }

        // Decrypt key with passphrase.
        passphrase := getPassPhrase(ctx, false)
        key, err := keystore.DecryptKey(keyjson, passphrase)
        if err != nil {
            utils.Fatalf("Error decrypting key: %v", err)
        }

        // Output all relevant information we can retrieve.
        showPrivate := ctx.Bool("private")
        out := outputInspect{
            Address: key.Address.Hex(),
            PublicKey: hex.EncodeToString(
                crypto.FromECDSAPub(&key.PrivateKey.PublicKey)),
        }
        if showPrivate {
            out.PrivateKey = hex.EncodeToString(crypto.FromECDSA(key.PrivateKey))
        }

        if ctx.Bool(jsonFlag.Name) {
            mustPrintJSON(out)
        } else {
            fmt.Println("Address:       ", out.Address)
            fmt.Println("Public key:    ", out.PublicKey)
            if showPrivate {
                fmt.Println("Private key:   ", out.PrivateKey)
            }
        }
        return nil
    },
}